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Scheme: ABCD EFG Pencil.png
Collection: EFG SiteStratigraphy Pencil.png
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SectionUnitStratigraphy-BiostratigraphicAttribution-RangePosition (also /SiteStratigraphy/SiteSections/SectionLog/SectionUnitStratigraphy/BiostratigraphicAttributions/BiostratigraphicAttribution/RangePosition): Range position if this attribution is the earliest, midway or latest in a possible range. e.g. It is not always clear what zone a particular taxon belongs to and therefore a range may be needed.

Constraints in the context of ABCD EFG: